A drum of a medicine sharing and packing device wherein a plurality of tablet cassettes 1a are arranged and passages are formed to guide tablets down, comprises a barrel-shaped drum body 1c formed in two circular arc shapes facing each other and auxiliary drums 1e mounted on the inner sides of opening portions 1d of the drum body 1c. The drum body 1c has the opening portions 1d formed on both sides facing each other and a plurality of tablet cassettes 1a are arranged detachably on the outer circumferential surface of the drum body 1. A plurality of tablets cassettes 1a are also arranged detachably on the circumferential surfaces of the auxiliary drums 1e.